I'm looking for a short story that has beings on another planet that game or duel with colored spheres (and possibly music). I thought it was by Sturgeon, but have been through all I could find of his & cannot find it. The ending has a woman/girl who plays/duels with them to the point where IIRC it is a standoff. The end has her still there forever and "they say that about her there is a hint of music" (or something like that). Loved it as a child, have never been able to find it again. Suspect it was published in F&SF, as I read that a lot back then.